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Old 07-10-2007, 05:08 PM   #1
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Default New Laptop questions

okay im in the market for a new laptop some time soon
and im just a little bit confused on some things and i was hoping that you all can help me out
i went to dell.com and built a inspiron 1721 laptop
the one thing that i am stuck on would be the hard drive
i chose the RAID Protection: 160 GB (2x 160 GB) 5400 RPM
does that mean that one hd would be for use and the other would be back up?
i havent bought it yet i just made it mine, i think that i could have gotten a 500 GB hd. i want a lot of space to play with here and so your suggestions will be greatly appreciated.
also what does RAID stand for?
what is so good about it and why do i see it every where?
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Old 07-10-2007, 05:14 PM   #2
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Default Re: New Laptop questions

RAID stands for: Redundant Arrays of Inexpensive (Independent has replaced Inexpensive) Disks.

It basically means that multiple HDDs will work as one, and thus achieving better performance than if you get 1 large HDD. So no, if they are in RAID, they work together.

Master/slave though is different.
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Old 07-10-2007, 05:35 PM   #3
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Default Re: New Laptop questions

if you need more answers i think that clarifies it check out the notebook review forums its more organized than this site with a desktop section also
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Old 07-10-2007, 05:45 PM   #4
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Default Re: New Laptop questions

Quote:
Originally Posted by Thelis View Post
RAID stands for: Redundant Arrays of Inexpensive (Independent has replaced Inexpensive) Disks.

It basically means that multiple HDDs will work as one, and thus achieving better performance than if you get 1 large HDD. So no, if they are in RAID, they work together.

Master/slave though is different.
This would also depend on the RAID configuration he is using. Your talking about a striped array, but he is talking about a mirrored array, so it depends on the setup he is getting mate.

These are the different types, you can also combine these aswell

RAID 0: Striped Set (2 disks minimum) without parity. Provides improved performance and additional storage but no fault tolerance from disk errors or disk failure. Any disk failure destroys the array, which becomes more likely with more disks in the array. The reason a single disk failure destroys the entire array is because when data is written to a RAID 0 drive, the data is broken into "fragments". The number of fragments is dictated by the number of disks in the drive. Each of these fragments are written to their respective disks simultaneously on the same sector. This allows smaller sections of the entire chunk of data to be read off the drive in parallel, giving this type of arrangement huge bandwidth. When one sector on one of the disks fails, however, the corresponding sector on every other disk is rendered useless because part of the data is now corrupted. RAID 0 does not implement error checking so any error is unrecoverable. More disks in the drive means higher bandwidth, but greater risk of data loss.
RAID 1: Mirrored Set (2 disks minimum) without parity. Provides fault tolerance from disk errors and single disk failure. Increased read performance occurs when using a multi-threaded operating system that supports split seeks, very small performance reduction when writing. Array continues to operate so long as at least one drive is functioning.
RAID 3 and RAID 4: Striped Set (3 disk minimum) with Dedicated Parity, the parity bits represent a memory location each, they have a value of 0 or 1, whether the given memory location they represent, is empty or full, thus enhancing the speed of read and write. This mechanism provides an improved performance and fault tolerance similar to RAID 5, but with a dedicated parity disk rather than rotated parity stripes. The single disk is a bottle-neck for writing since every write requires updating the parity data. One minor benefit is the dedicated parity disk allows the parity drive to fail and operation will continue without parity or performance penalty.
RAID 5: Striped Set (3 disk minimum) with Distributed Parity. Distributed parity requires all but one drive to be present to operate; drive failure requires replacement, but the array is not destroyed by a single drive failure. Upon drive failure, any subsequent reads can be calculated from the distributed parity such that the drive failure is masked from the end user. The array will have data loss in the event of a second drive failure and is vulnerable until the data that was on the failed drive is rebuilt onto a replacement drive.
RAID 6: Striped Set (4 disk minimum) with Dual Distributed Parity. Provides fault tolerance from two drive failures; array continues to operate with up to two failed drives. This makes larger RAID groups more practical. This is becoming a popular choice for SATA drives as they approach 1 Terabyte in size. This is because the single parity RAID levels are vulnerable to data loss until the failed drive is rebuilt. The larger the drive, the longer the rebuild will take. With dual parity, it gives the array time to rebuild onto a large drive with the ability to sustain another drive failure.

Even more info here http://en.wikipedia.org/wiki/RAID
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Old 07-10-2007, 10:36 PM   #5
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Default Re: New Laptop questions

well now i completely understand the raid phenomenon
now my other remaining question
when i chose the hd for the future laptop did i choose 2 hard drives one master and the second is a backup?
or is there enough info to really tell?
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Old 07-10-2007, 10:37 PM   #6
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Default Re: New Laptop questions

I am guessing that they are functioning as one big HD, but I do not believe there is a way to see.
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Old 07-10-2007, 10:39 PM   #7
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Default Re: New Laptop questions

in a RAID configuration if lets say one HDD gets corrupt then your other HDD will be able to be booted from but they act like one HDD. it is basicaly like having a hidden HDD with all your data on it just in case the real one fails. also if you wanted to you could have 320GB of storage without RAID protection
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Old 07-10-2007, 11:19 PM   #8
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Default Re: New Laptop questions

cool everyone has helped me enough to make a decision and im going to go back and take a look at my options
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Old 07-10-2007, 11:34 PM   #9
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Default Re: New Laptop questions

Judging by how it says "RAID protection" I'm assuming it's a RAID 1, to protect your data.

Let us know what you decide to get.
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Old 07-11-2007, 11:59 AM   #10
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Default Re: New Laptop questions

i went back and chose the RAID 500 GB (2x 250GB)
i want a friggen butt load of space on this sucker and i think that will just about do it
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